Hammer LCD 8bit Color STN

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Revision as of 08:31, 8 December 2009 by Davydotcom (Talk | contribs)

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This is a "HowTo" for the Panasonic EDMGRB8KJF (Datasheet) available from EarthLCD to be used with the Hammer development module from TinCanTools

Matching Pinouts
Pin Number Hammer Note LCD Pin Number
16 VM Display On/Off DISPON 16
17 VFRAME LCD Vertical sync FRM 20
18 VLINE LCD Horizontal sync LOAD 14
19 VCLK LCD pixel clock CP 12
21 LCD_VD0 LCD data bit 0 Data0 9
22 LCD_VD1 LCD data bit 1 Data1 8
23 LCD_VD2 LCD data bit 2 Data2 7
24 LCD_VD3 LCD data bit 3 Data3 6
25 LCD_VD4 LCD data bit 4 Data4 4
26 LCD_VD5 LCD data bit 5 Data5 3
27 LCD_VD6 LCD data bit 6 Data6 2
28 LCD_VD7 LCD data bit 7 Data7 1
+3.3V VDD 10
+3.3V VDD 11
+3.3V VDD 13
Ground VSS 5
Ground VSS 15
Ground VSS 17
Ground VSS 19
Contrast +1.95V (+-0.8V) VCON 18

NOTE: VCON should be variable control to adjust contrast and the VDD should have separate power control, i.e. via a gpio

NOTE: This display also requires a backlight inverter (see datasheet for requirements)

Linux Kernel Build Notes

In order to get this screen to work framebuffer support has to be built into your kernel.

 cd hammer/source/linux-
 export ARCH=arm
 export CROSS_COMPILE=arm-linux-uclibc-
 make menuconfig 
 Device Drivers ->  Graphics Support -> Support for frame buffer devices
 Inside this sub menu add:
 [*] Enable Video Mode Handling Helpers
 <*> S3C2410 LCD framebuffer support
 Under Device Drivers -> Graphics Support -> Console display driver support ADD
 Framebuffer Console Support

NOTE: It is also a good idea to go ahead and add the boot logo.

The next step is to add the display settings to your mach-tct_hammer.c file in ./arch/arm/s3c2410 If you have questions about this file please see the linux documentation ( I will try to make a patch for this at a later date)